<template>
  <div class="list" ref="wrapper">
      <div>
        <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{this.currentCity}}</div>
                    </div>
                </div>
        </div>
        <div class="area">
            <div class="title border-topbottom">热门城市</div>
            <div class="button-list">
                <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
                    <div class="button">{{item.name}}</div>
                </div>
        </div>
        </div>
        <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
            <div class="title border-topbottom">{{key}}</div>
            <div class="item-list" v-for="items of item" :key="items.id" @click="handleCityClick(items.name)">
                <div class="item border-bottom">{{items.name}}</div>
            </div>
        </div>
      </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hot: Array,
    letter: String
  },
  computed: {
    // ...mapState(['city'])
    // 把vuex中state中的city  映射到  计算属性中  叫做currentCity
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    handleCityClick (city) {
      // this.$store.commit('changeCity', city)
      this.changeCity(city)
      this.$router.push('/')
    },
    // 把vuex中mutations中的changeCity  映射到  方法中  同名
    ...mapMutations(['changeCity'])
  },
  // 监听器
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper, {
      observeDOM: true
    })
  }
}
</script>

<style lang='stylus' scoped>
  @import '~style/varibles.styl'
  .border-topbottom
    &:before
        border-color: #ccc
    &:after
        border-color: #ccc
  .border-bottom
    &:before
        border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
        line-height: .54rem
        background: #eee
        padding-left: .2rem
        color: #666
    .button-list
        overflow: hidden
        padding: .1rem .6rem .1rem .1rem
        .button-wrapper
            float: left
            width: 33.33%
            .button
                margin: .1rem
                padding: .1rem 0
                text-align: center
                border: .02rem solid #ccc
                border-radius: .06rem
    .item-list
        .item
            line-height: .76rem
            padding-left: .2rem

</style>
